农作物病害损失率估算方法探讨  

A method for estimation of loss rate caused by crop diseases

作　　者：杨凌峰[1] 易红娟[1] 

机构地区：[1]江苏省通州市植保站,通州226300

出　　处：《植物保护》2014年第3期127-129,146,共4页Plant Protection

摘　　要：本文以油菜菌核病为分析对象来研讨作物病害的损失率估算方法,得出当病害发病程度和损失呈直线关系时,损失率一般方程式可表示为Y=(a×发病率+b×K×病情指数)/100,2012年经对36块油菜田菌核病损失率进行估算,并与观测值进行卡平方检验,结果理论值与实测值差异极小,表明此方程可靠性高,可用于病害损失率的准确估算。Taking rape Sclerotinia rot as an object,the author described an estimation method for loss rate caused by crop diseases.When there is a linear relationship between the occurrence degree and the loss rate,the equation of loss rate could be shown as：Y =（a X1 ＋ b K X2）/100,X1 was the disease incidence,X2 was the disease index.In 2012,loss rate caused by Sclerotinia rot in 36 rape fields was evaluated with the equation.Chi-square test showed that little difference was found between the theoretical value and the survey value,indicating that the equation could be applied to estimate the loss rate caused by crop diseases.

关 键 词：发病率 病情指数 方程 损失率 

分 类 号：S431[农业科学—农业昆虫与害虫防治]